Epistolary Apologies

A list of template letters for occasions on which one ought to apologize in writing, from Great Personal Letters for Busy People: 501 Ready-to-Use Letters for Every Occasion by Dianna Booher, published by McGraw-Hill in 2005.
For not having written
For forgetting someone’s name
For failing to invite friend to party
For making embarrassing remark
For behaving inappropriately
For a friend behaving inappropriately
For missing anniversary
For missing birthday
For missing funeral
For missing deadline
For bouncing cheque to friend or relative